linux-kernel - Re: [RFC v2 1/9] x86/mm: Introduce MSR_IA32_CORE

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Message-ID: <682780d0-583b-49bd-b79a-95a30ce0ec04@intel.com>
Date: Wed, 21 May 2025 07:57:01 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Rik van Riel <riel@...riel.com>, linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org, x86@...nel.org, kernel-team@...a.com,
 dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
 tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
 nadav.amit@...il.com, Yu-cheng Yu <yu-cheng.yu@...el.com>
Subject: Re: [RFC v2 1/9] x86/mm: Introduce MSR_IA32_CORE_CAPABILITIES

On 5/19/25 18:02, Rik van Riel wrote:
> MSR_IA32_CORE_CAPABILITIES indicates the existence of other MSRs.
> Bit[1] indicates Remote Action Request (RAR) TLB registers.

Nit: This may have changed from when Yu-cheng wrote the changelog, but
RAR can do more than just flush the TLB. This probably needs to get a
refresh.